<template>
  <div>
    <span>全选:</span>
    <input v-model="isAll" type="checkbox" />
    <button @click="faBtn" >反选</button>
    <ul>
      <li v-for="(obj,index) in arr" :key="index">
        <input v-model="obj.checked" type="checkbox" />
        <span>{{obj.name}}</span>
      </li>
    </ul>
  </div>
</template>

<script>
export default {
  data() {
    return {
      arr: [
        {
          name: "猪八戒",
          checked: false,
        },
        {
          name: "孙悟空",
          checked: false,
        },
        {
          name: "唐僧",
          checked: false,
        },
        {
          name: "白龙马",
          checked: false,
        },
      ],
    };
  },
  computed:{
      isAll:{
          set(val){
             this.arr.forEach(obj=>obj.checked=val)
          },
          get(){
             return  this.arr.every(obj=>obj.checked===true)
          }
      }
  },
  methods:{
      faBtn(){
          this.arr.forEach(obj=>obj.checked=!obj.checked)
      }
  }
};
</script>

<style>
</style>